Replying to Knee Brace for Meniscus?

Hey Guys,
I have had two surgeries on my medial meniscus on my left knee and am about to have one on my right knee's medial meniscus in two weeks.  I was wondering if any of you guys have experience using a knee brace for past MENISCUS problems.  I will ask my doc about them but want some background info which is why I'm making this thread.  I search-barred knee braces but didn't see anything about whether they can help prevent meniscus damage (mainly ACL/MCL).  I'm sure they will help bring stability to my weakened knees but I want to get a better idea if they are worth potentially spending a good chunk of money.  I am researching the Donjoy Armor and Defiance and the Ossur CTI. Any suggestions on braces and whether or not it would be worth it for me would be appreciated.

Other info: I am a fairly big guy. 6'2 205lbs so that may play a factor into it. 

P.S. I know it doesn't substitute for PT.